Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Generic serial GNSS receiver driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2018 Johan Hovold <johan@kernel.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/gnss.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/pm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/pm_runtime.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/serdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include "serial.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) static int gnss_serial_open(struct gnss_device *gdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	struct gnss_serial *gserial = gnss_get_drvdata(gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	struct serdev_device *serdev = gserial->serdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	ret = serdev_device_open(serdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	serdev_device_set_baudrate(serdev, gserial->speed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	serdev_device_set_flow_control(serdev, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	ret = pm_runtime_get_sync(&serdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		pm_runtime_put_noidle(&serdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		goto err_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) err_close:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	serdev_device_close(serdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) static void gnss_serial_close(struct gnss_device *gdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	struct gnss_serial *gserial = gnss_get_drvdata(gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	struct serdev_device *serdev = gserial->serdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	serdev_device_close(serdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	pm_runtime_put(&serdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) static int gnss_serial_write_raw(struct gnss_device *gdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		const unsigned char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	struct gnss_serial *gserial = gnss_get_drvdata(gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	struct serdev_device *serdev = gserial->serdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	/* write is only buffered synchronously */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	ret = serdev_device_write(serdev, buf, count, MAX_SCHEDULE_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	if (ret < 0 || ret < count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	/* FIXME: determine if interrupted? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	serdev_device_wait_until_sent(serdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) static const struct gnss_operations gnss_serial_gnss_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	.open		= gnss_serial_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	.close		= gnss_serial_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	.write_raw	= gnss_serial_write_raw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) static int gnss_serial_receive_buf(struct serdev_device *serdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 					const unsigned char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	struct gnss_serial *gserial = serdev_device_get_drvdata(serdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	struct gnss_device *gdev = gserial->gdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	return gnss_insert_raw(gdev, buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) static const struct serdev_device_ops gnss_serial_serdev_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	.receive_buf	= gnss_serial_receive_buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	.write_wakeup	= serdev_device_write_wakeup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) static int gnss_serial_set_power(struct gnss_serial *gserial,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 					enum gnss_serial_pm_state state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	if (!gserial->ops || !gserial->ops->set_power)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	return gserial->ops->set_power(gserial, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)  * FIXME: need to provide subdriver defaults or separate dt parsing from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)  * allocation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static int gnss_serial_parse_dt(struct serdev_device *serdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	struct gnss_serial *gserial = serdev_device_get_drvdata(serdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	struct device_node *node = serdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	u32 speed = 4800;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	of_property_read_u32(node, "current-speed", &speed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	gserial->speed = speed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct gnss_serial *gnss_serial_allocate(struct serdev_device *serdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 						size_t data_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	struct gnss_serial *gserial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	struct gnss_device *gdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	gserial = kzalloc(sizeof(*gserial) + data_size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	if (!gserial)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	gdev = gnss_allocate_device(&serdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	if (!gdev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		goto err_free_gserial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	gdev->ops = &gnss_serial_gnss_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	gnss_set_drvdata(gdev, gserial);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	gserial->serdev = serdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	gserial->gdev = gdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	serdev_device_set_drvdata(serdev, gserial);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	serdev_device_set_client_ops(serdev, &gnss_serial_serdev_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	ret = gnss_serial_parse_dt(serdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		goto err_put_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	return gserial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) err_put_device:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	gnss_put_device(gserial->gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) err_free_gserial:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	kfree(gserial);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	return ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) EXPORT_SYMBOL_GPL(gnss_serial_allocate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) void gnss_serial_free(struct gnss_serial *gserial)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	gnss_put_device(gserial->gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	kfree(gserial);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) EXPORT_SYMBOL_GPL(gnss_serial_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) int gnss_serial_register(struct gnss_serial *gserial)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	struct serdev_device *serdev = gserial->serdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	if (IS_ENABLED(CONFIG_PM)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		pm_runtime_enable(&serdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		ret = gnss_serial_set_power(gserial, GNSS_SERIAL_ACTIVE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	ret = gnss_register_device(gserial->gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		goto err_disable_rpm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) err_disable_rpm:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	if (IS_ENABLED(CONFIG_PM))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		pm_runtime_disable(&serdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		gnss_serial_set_power(gserial, GNSS_SERIAL_OFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) EXPORT_SYMBOL_GPL(gnss_serial_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) void gnss_serial_deregister(struct gnss_serial *gserial)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	struct serdev_device *serdev = gserial->serdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	gnss_deregister_device(gserial->gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	if (IS_ENABLED(CONFIG_PM))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		pm_runtime_disable(&serdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		gnss_serial_set_power(gserial, GNSS_SERIAL_OFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) EXPORT_SYMBOL_GPL(gnss_serial_deregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) #ifdef CONFIG_PM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) static int gnss_serial_runtime_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	struct gnss_serial *gserial = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	return gnss_serial_set_power(gserial, GNSS_SERIAL_STANDBY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) static int gnss_serial_runtime_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	struct gnss_serial *gserial = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	return gnss_serial_set_power(gserial, GNSS_SERIAL_ACTIVE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) #endif /* CONFIG_PM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) static int gnss_serial_prepare(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	if (pm_runtime_suspended(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) static int gnss_serial_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	struct gnss_serial *gserial = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	 * FIXME: serdev currently lacks support for managing the underlying
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	 * device's wakeup settings. A workaround would be to close the serdev
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	 * device here if it is open.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	if (!pm_runtime_suspended(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		ret = gnss_serial_set_power(gserial, GNSS_SERIAL_STANDBY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) static int gnss_serial_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	struct gnss_serial *gserial = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	if (!pm_runtime_suspended(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		ret = gnss_serial_set_power(gserial, GNSS_SERIAL_ACTIVE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) #endif /* CONFIG_PM_SLEEP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) const struct dev_pm_ops gnss_serial_pm_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	.prepare	= gnss_serial_prepare,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	SET_SYSTEM_SLEEP_PM_OPS(gnss_serial_suspend, gnss_serial_resume)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	SET_RUNTIME_PM_OPS(gnss_serial_runtime_suspend, gnss_serial_runtime_resume, NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) EXPORT_SYMBOL_GPL(gnss_serial_pm_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) MODULE_AUTHOR("Johan Hovold <johan@kernel.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) MODULE_DESCRIPTION("Generic serial GNSS receiver driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) MODULE_LICENSE("GPL v2");